First, connect your iPhone to Computer, through USB Cable. Open iTunes and select your device. Mac User - Hold "option" key and then click on "update". Windows User - Hold down "Shift" key and then click on "Update" button. Now, select the IPSW file that you have downloaded and click on the choose button.
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Open the "Settings" app on iPhone, then go to "General" and go to "Software Update". When "iOS 13" shows as available, choose "Download & Install". The update will automatically download and then reboot the iPhone to start the installation of, rebooting again to complete the software update to iOS 13. It may take a while to
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